Machine for mining coal.



C. H. BOARDMAN.

MACHINE Non MINING GOAL.

APPLICATION FILED MAR.24, 1914.

I, I 30,250., Patented. Nar. 2, 1915.

//x//////////////// yff/,///f///,l////f I i a specification.

@nantes H. BoeRnMaatQoF COLUMBUS;,onIo,-Assenon To sUNDnIEs Menoreernn#i Lne COMPANY, oefron'rtenn, MAINE.

MACHINE Lion-MINING' ooAL.

Montese.

To aZZ 20.720711 it may; concern Be it known that I., CHARLES H. BOARD-MAN, a citizen of the United States, residing at Columbus.' in thecounty of Franklin and State of Ohio, haveinvented certain new anduseful Improvements inf Machines for Mining Coal, of whichthe followingris Mv invention relates to machines for mining coal, of. the type whichact to undercut the mineral at the end of a heading, or any other'nallof passage or chamber in a mine. v

The invention particularly relatesto a portable machine 'provided withspaced apart cutting; mechanisms. cutting to relatively differentdepths. and having means for removing the material between them as it iscut. l

Attempts have been made to utilize machines which have had onlv a singlecutting 'mechanismso located with respect tothe frame ot the machinethat when the said machine is placedon the door oft' a mine. and broughtup to the wall from which the mineral is to be cut a narrow slitextendingr horizontalljT into the Wall near the tloor will be made.Finch machines are unsatisfactorv in their operation. because the slitsproduced. as above described. are so shallow that when the supernosedmineral is broken the mineral is down bv .r'edgini oYA blast not brokeninto suiiioientlv small lumps for' convenient and'practical loadina andhan; dline. except bv emplovrnent ot an excessivelv large charge ofexplosive., but is loosened as a large mass oi. nerhaps. several 'tonsin weight. which must be subseouentlv shot or picked to' pieces. Anothermode of .getting convenient sized pieces with a shallow undercut. is bvmaking lieavv blast and 4breaking the mass oi" coal bv the force of theblast butL this isiivasteiiul of explosive, and has the additional disadvant'aoe ot shatteringT the' coal too much. with production of toolarge a proportion of dust.

Mv invention aims to overcome the 'obiections above indicated. bfproviding a'noa chine for malrine a deep undercut. which is simple andeasily operated.' and in which there are spaced apart cutting;mechanisms. each equipped with a series `ot' cutters or disks. saidcutting' mechanisms being located one above tbe otherR With clear spacehctwee'n, to the end that the' machine ma;7

Y specification of Leners patent. Patented Mar. om, applicati@ ineaMarch 24,1914. seriarNo. 826,963. l I I make tivo separated' cutssimultaneousljv.E andat the lsame time remove the mineral between thecuts. The lower cutting mech` anism is arranged to out into the Wall toe greater depth than lthe upper cutting'mechyamsm, Wherebv-When thecutting action has.

been completed. a deep undercut is produced having an overhanoing Wedgeshaped portion at the rear. Thus a considerable die tance is providedthrough 'which the mineral above the-undercut'rnafv fall.l andynhen saidmineral is brought down bv anv of the coin-v Amonlv practised methods.it fulcriims upon the overhanging wedge shaped portion ot the cut so asto roll about the same.v causing it to be broken into lumps ofconvenient size for handling when it strikes the bottom..l

'and tree froin'anv large proportion of dust.

vthe frame of the machine ot :inv suitable or preferred construction.which contains in its'interinr the orc-rating mechanism. and fromWhich-extends tivo arms il and lil (me of which is dircctlv above theother.

The arm l1 is shorter than tbe arm 19;. thc I arrangement beinel suchthat the iov-Ward end ot the lower arm extends bevond the forward end'otthe upper arm. Both ,arms are constructed with guide-wave at theiredges` and vguide Wheels or pullevs 15S at their yends. through andabout which pass? endless chains 11i. 15. respectivelv. carrvilngl.`cut-ters or bits 16; Niere the chainslpass into tbe traine ot themachine. th-ev are .suoported and driven bv suitable drive wheels' orsprockets not shown). thearranfenient illustrated. the Working extremitvof the lower chain extends bevond/the forward extremitv of tbe otherchain. i

As appearsfrom the side view (Fig. l). certain of the cutters arentl-set respective v npwardlv and downwardlv 'from the carrv in!! chainto a distance somewhat above and below the supporting;l arm, 'Whileother cutsaid arms, and critters carried by., said' ward workinvextremity of the other, cut- 1e.

chains for cuttin fthe material and'` reters carried y said carriers,and movable moving the severe material as the cutting supporting meansfor said carriers. progresses.' v v Inte mony lvvhereof'l atix mysignal;, A5. .A mining machine comprising endless -ture in presence oftwo witnesses. H traveling .cutter carriers mounted t'o travel CHARLESH. BOARDMAN.

in the same direction, one above the other Witnesses.: f the forward-1working extremity of one of W. E. Gunnison,

'd yin advance of the for- I C. H. BoAnomN,-Jr.

